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NRF52811-QCAA-R Datasheet(PDF) 282 Page - Nordic Semiconductor |
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NRF52811-QCAA-R Datasheet(HTML) 282 Page - Nordic Semiconductor |
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282 / 444 page  Peripherals Symbol Description Min. Typ. Max. Units tACQ,400k Acquisition time (configurable), source Resistance <= 400kOhm 20 µs tACQ,800k Acquisition time (configurable), source Resistance <= 800kOhm 40 µs tCONV Conversion time <2 µs EG1/6 Errorb for Gain = 1/6 -3 3 % EG1/4 Errorb for Gain = 1/4 -3 3 % EG1/2 Errorb for Gain = 1/2 -3 4 % EG1 Errorb for Gain = 1 -3 4 % CSAMPLE Sample and hold capacitance at maximum gain21 2.5 pF RINPUT Input resistance >1 MΩ ENOB Effective number of bits, differential mode, 12-bit resolution, 1/1 gain, 3 µs acquisition time, crystal HFCLK, 200 ksps 9 Bit SNDR Peak signal to noise and distortion ratio, differential mode, 12-bit resolution, 1/1 gain, 3 µs acquisition time, crystal HFCLK, 200 ksps 56 dB SFDR Spurious free dynamic range, differential mode, 12-bit resolution, 1/1 gain, 3 µs acquisition time, crystal HFCLK, 200 ksps 70 dBc RLADDER Ladder resistance 160 kΩ 6.17.13 Performance factors Clock jitter, affecting sample timing accuracy, and circuit noise can affect ADC performance. Jitter can be between START tasks or from START task to acquisition. START timer accuracy and startup times of regulators and references will contribute to variability. Sources of circuit noise may include CPU activity and the DC/DC regulator. Best ADC performance is achieved using START timing based on the TIMER module, HFXO clock source, and Constant Latency mode. 6.18 SPI — Serial peripheral interface master The SPI master provides a simple CPU interface which includes a TXD register for sending data and an RXD register for receiving data. This section is added for legacy support for now. b Does not include temperature drift 21 Maximum gain corresponds to highest capacitance. 4454_140 v1.0 282 |
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